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A cohort life table tracks organisms through the stages of life, while a static life table shows the distribution of life stages among the population at a single point in time. [ 3 ] Following is an example of a cohort life table based on field data from Vargas and Nishida (1980). [ 4 ]
Though the progression can be influenced by abiotic and biotic factors such as temperature and food, [8] Dyar's Law can be accurately used to differentiate instars of immature insects and to predict the size of instars missing from samples, crucial data for accurately delineating insect developmental histories.
C. metallifer is characterized by large mandibles in the male. Mandible growth is regulated by juvenile hormone, which controls many aspects of insect growth. [8] Exact mandible size varies and is primarily determined by nutrition in the larval stage. There is a relationship between body size and the length of mandibles, which is a heritable ...
Insect herbivores such as bark beetles and their symbiotic fungal pathogens, pose as one of the greatest threats to conifer survival.When they feed on conifers, the subsequent wounds trigger a signaling cascade that results in the production of terpene synthases of many types, [a] all of which arise from the terpene synthase gene cluster known as Tpsd. [4]
For most insect species, an instar is the developmental stage of the larval forms of holometabolous (complete metamorphism) or nymphal forms of hemimetabolous (incomplete metamorphism) insects, but an instar can be any developmental stage including pupa or imago (the adult, which does not moult in insects). Two instars of a caterpillar of ...
Survivorship curves can be constructed for a given cohort (a group of individuals of roughly the same age) based on a life table. There are three generalized types of survivorship curves: [ 1 ] Type I or convex curves are characterized by high age-specific survival probability in early and middle life, followed by a rapid decline in survival in ...
Holometabolism, also called complete metamorphosis, is a form of insect development which includes four life stages: egg, larva, pupa, and imago (or adult). Holometabolism is a synapomorphic trait of all insects in the superorder Holometabola .
The majority of Dipteran species that have had a life table constructed have demonstrated a tendency for smaller bodies in the warmer months. C. megacephala has a relatively [clarification needed] long lifespan as an adult which has helped the species become successful at invading new geographical areas. The long adult lifespan means that the ...